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Finding the Fourth Proportional to 1,250.11, 1,875.17 and 428.62

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Solution

The fourth proportional to 1,250.11, 1,875.17 and 428.62 is: 642.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,250.11 : 1,875.17 = 428.62 : x
  2. Step 2: Convert to fraction form
    1,250.11/1,875.17 = 428.62/x
  3. Step 3: Cross multiply
    1,250.11x = 1,875.17 × 428.62
  4. Step 4: Simplify right side
    1,250.11x = 803,733.22
  5. Step 5: Solve for x
    x = 803,733.22/1,250.11
  6. Step 6: Final answer
    x = 642.93

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.